Réponse:
4x-y=-18
x=-18/4 / y=_18
_2x+6y=20
2(-x+3y)=20
-x+3y=20/2
-x=10 / 3y=10
x=-10 / y=10/3
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Réponse:
4x-y=-18
x=-18/4 / y=_18
_2x+6y=20
2(-x+3y)=20
-x+3y=20/2
-x=10 / 3y=10
x=-10 / y=10/3